Schedule 80 and schedule 40 pipe are among the most common types of steel pipe used today for pressurized applications. The schedule sets standards for the minimum inside wall thickness that is required for a certain diameter of steel pipe.[PDF]

Steel Pipe Dimensions & Sizes Chart (Schedule 40, 80 Pipe) Means POSTED ON 2017-11-01 People always confused about how to describe steel pipe dimensions (sizes) in correct ways, or how to clarify to seller what exactly pipe size we are going to purchase.